[coreboot] Cold reset in Tyan s2912

[yhlu]

On Feb 5, 2008 7:48 AM, Roman Kononov <kononov at dls.net> wrote:
> On 2008-02-05 00:48 yhlu said the following:
>
> > On Feb 4, 2008 9:29 PM, Roman Kononov <kononov at dls.net> wrote:
> >> I have difficulty cold-resetting Tyan s2912, which has mcp55.
> >>
> >> The sequence
> >>      outb(0x2,0xcf9);
> >>      outb(0x6,0xcf9);
> >> is a warm reset. It does not reset the HyperTransport link frequency and width.
> >
> > how do you know?
> >
> > do you have other co-processor or htx installed?
>
> I have a co-processor.
>
> The sequence I hope to have:
>
> 1) Power up. Power-on reset. The co-processor takes long time to become
> alive (~500s). By this time the CPU thinks that the HT link is dead.
> 2) CPU issues another reset.
> 3) The CPU re-initializes the HT link and the connection is happy.
>
> With the above sequence, the step 3) is a warm reset, and the CPU does
> not attempt to re-initialize the link.

that is co-processor problem.

Please talk the co-processor vendor about that. they have solution for
you problem. otherwise return that to get one from another vendor.

YH